//C16:16.4:glue.c -- ## operator.
#include <stdio.h>
#define XNAME(n) x ## n
#define PRINT_XN(n) printf("x" #n " = %d\n", x ## n);

int main(void)
{
    int XNAME(1) = 14;    // change to int x1 = 14;
    int XNAME(2) = 20;    // change to int x2 = 20;
    PRINT_XN(1);          // change to printf("x1 = % d n", x1);
    PRINT_XN(2);          // change to printf("x2 = % d n", x2);
}